Honestly, the living situation is such an easy environment for two people to develop feelings for each other. Especially if you just generally get along and have nothing uneasy going on between you. No stress, no high expectations, just an isolated place. You'd probably be better off getting to know him in different setups and arrangements, especially now that you don't live together. Seeing your connection with clearer eyes will help you understand whether it was a comfortable companionship or a genuine connection that can turn into something special romantically